Cutting tool



Jan. 144, 1930. G. VAN YA'HRES CUTTING Toor.

Filed April '7, 1927 WESSES Ulm Patented Jan. 14, 1930 GEORGE VANYAHRES, OF WESTBURY, NEW YORK PATENT OFFICE CUTTING TOOL Application ledApril 7,

' This invention relates to cutting tools, and has especial reference towood cutting tools.

Some of the objects of the present invention are to provide a cuttingtool in combination with an automatic power means adapted to operate orimpart impulses tothe work performing implement of the tool for thecutting operation, subject to the engagement of the -work performingimplement with the work; to provide a tool of the indicatedcharacterwith which the depth ofthe cut of the work performing implementor cutter is dependent upon the amount of pressure or force exerted `onthe implement or cutter while in `15 operation; to provide a tool of theindicated character in which the work performing implement or cutter maybe quickly and easily detached to be replaced by another, and

which permits "the holder of the work performing implement or cutter tobe quickly and easily detached when the latter is stuck; and to providea cutting tool which is comparatively simple in construction andreliable in operation.

The nature of the invention and its distinguishing features andadvantages will appear when the following specification is read inconnection with the accompanying drawing, in which i u Figure 1 is asectional elevation of Va tool embodying the present invention and show`ing the work performing implement or cut- T ter in its normal position;the tool being con nected with an automatic power device or hammer forimparting impulses to the work performing element or cutter.

Figure 2 is a view similar toFigure l'showi'ng the work performingelement or cutter in a position to receive impulses from the powermeans.

Figure 3 is a View similar to Figure 1 showing the work performingimplement or cutter ready to be detached from the holder-` or guide ofthe tool.

Figure 4 is a sectional view taken on the line 1 -4: of Figure 1.

Generally stated, the tool of the present invention will comprise a workperforming implement or cutter 10 of any preferred type, a holder orguide 11, tension means 12, and an 1927. serial No. 181,788.

automatic power meansl for rapidly imparting impulses to the implementor cutter 10.

In the present instance, the work performing implement or cutter 10 isin the form of a gouge having a cutting edge 111 at one end, and a shank15 which provides an anvil 16 at the end thereof. The holder or guide 11includes a barrel 17 having a bushing or bearing 18 at one end. The saidbushing or bearing may form aseparate part of the barrel and be liXedlysecured thereto, or may' be formed integral with the barrel 17. Theopposite end of the barrel 17 has a bushing or bearing 19 which formsaseparate part' ,of the barrel and is fixedly secured thereto.

The bushings or bearings 18 `and 19 provide bores 20 and 21respectively, which are in axial alignment and accommodate the shank 15of the implement or cutter 10.

In order, to mount the work performing implement or cutter 10 forreciprocation, also to prevent the` same from having turningmovement,`and so that the implement or cutterv may be quickly and easilvassociated with the holder or guide 11 and be quickly and easilydetached, there is provided a means presently to be described. Thebushing or bearing 18 has a pair of grooves22 which are arrangeddiametricallyI opposite each other* on the inside of the bushing 'orbearing 18, and each of which opens through each end of the bushing orbearing 18, as shown most clearly in Figure 3. There is also provided apair of grooves or keyways 23, which are arranged diametrically oppositeeach other on the inside of the bushing or bearing 18. The grooves orkeyways 23 are disposed in a plane substantially at a right angle to theplane of the grooves 22. Each of the key- -ways 23 is closed at one endto provide a shoulder 24 and opens through the inner end of the bearing18, yas shown most clearly in Figure 2. The shank 15 of the cutterlO isprovided with keys or the like 25, disposed diametrically opposite eachother, and keys `orthe like 26 also disposed diametrically opposite eachother. The keys 26 are spaced a suitable distance from the keys 25 inthe length of the shank 15. The keys 25 and 26 into the keyWays 23, asshown most clearly in Figure 1. The cutter 1() is thus allowed to havereciprocating increment, and is prevented from turning While the keys 25are in the keyvvays 23. i

The tensioning means 12 serves for yield- Yingly holding or positioningthe Work performing implement or cutter normally forward. The said means12 is in the form of an expansion coil spring surrounding the shank 15and arranged in the barrel 17, with one end thereof in contact with thebushingl or bearing 19 and the opposite end thereof in contact with aWasher or .the like 27 which is loose on the shank 15. The said Washer27 is engaged by the keys 26 when thecutting edge 14 is in contact withthe Work to vcompress the spring 12 to increase the pressure or tensionon the cutter 10.

The automatic power means 13 for imparting impulses tothe cutter 10 maybe of any preferred type, such as a pneumatic ham'- mer, the effectiveend of which is designated '28 `and which essentially includes areciprocating impulse element or hammer 29. The pneumatic hammer 28 isoperatively connected with the holder orrguide 11 in any preferredmanner so as to maintain the alignment of the hammer 29 with the anvil16 of the shank 15. The anvil 16 Will be spaced from the hammer29 whenthe cutter 10 is in its .normal position. The cutter 10 will be operatedby the hammer 29 subject to the engagement of the cutting edge 14 withthe work. It will therefore be understood that the pneumatic hammer 28may be kept constantly in operation While the cutter 10 remainsinactive.

The tool of the present invention is designed for carrying out cuttingoperations on tree trunks and branches, for trimming out decayedportions to form cavities which are filled to remedy the decayedportions of the trees. In order to cause the reciprocation of the cutter10, it is only necessary to bring the cutting edge 14 in Contact withthe work with the holder or guide 11 in one hand. This brings the anvil16 against the hammer 29 which operates to rapidly impart impulses tothe anvil. The spring 12 functions to set up a reaction to the action ofthe hammer 29 to make it possible for the cutter 10 to be rapidly recirocated. It is also to be understood that t e greater the pressure orforce 6I which is applied to the cutter 10, the greater Will be thedepth of the cut made by the cutter, because the stroke of the cutter isdependent upon the disposition of the holder or guide 11 With respect tothe shank 15.

It Will be obvious that to separate the cutter from the holder it isonly necessary to move the cutter longitudinally until the keys 25 and26 are out of the keyWays A23, Whereupon the cutter may be turned untilthe keys are in registration With the grooves 22. The cutter 10 may bethen slid longitudinally until the keys 25 and 26 pass out of thegrooves 22. It should also be obvious that if the cutter 10 is stuck,the holder or guide 11 may be separated by moving the same relatively tothe shank of the cutter to disengage the keys 25 and 26.

I claim:

1. A tool comprising a Work implement, a

handle-guide having bushings to support the Work implement forreciprocation, one of.

said bushings having a. slot extending longitudinally thereof andOpening through 0pposite ends of the bushing, said bushing also having akeyway extending longitudinally thereof and opening through one end ofsaid bushing, a key on said vWork implement adapted to pass through theslot and into the keyvvay for the purpose of associating the Workimplement With the handle-guide or for separating the same therefrom,said key when disposed in said keyway serving to prevent the Workimplement from turning and allowing it to reciprocate, and yieldablemeans having a normal tendency to urge the Work implement andhandle-guide relatively in opposite directions.

2. A tool comprising a Work implement, a handle-guide having bushings tosupport the Work implement for reciprocation, one of said bushingshaving slots extending longi- Ways for the purpose of associating theWork implement With the handle-guide or for separating the sametherefrom, said keys when disposed in said keyways serving to preventthe Work implement from turning and allowing it to reciprocate, andyieldable means acting on a pair of said keys and a portion of saidhandle guide and having a normal tendency to urge the Work 4implementand handle n guide relatively in opposite directions.

GEORGE VAN YAHRES.

